[pcp] pcp updates

[Ken McDonell]

I'll leave to the release consortium to decide if this should be in 3.1
or held over.

Works fine on all the platforms I can test, passes QA -g dbpmda on
Linux.

Changes committed to git://oss.sgi.com/kenj/pcp.git dev

 configure.in                   |   31 ++++++++++
 man/man1/dbpmda.1              |   16 +++++
 src/dbpmda/src/GNUmakefile     |    2 
 src/dbpmda/src/dbpmda.c        |    2 
 src/dbpmda/src/lex.l           |  117 ++++++++++++++++++++++++++++++++++-------
 src/include/builddefs.in       |    2 
 src/include/platform_defs.h.in |    1 
 7 files changed, 150 insertions(+), 21 deletions(-)

commit aa965191c671b0148bc99bd5fbc82dacc8ef44a2
Author: Ken McDonell <kenj at internode.on.net>
Date:   Wed Jan 27 06:25:23 2010 +1100

    readline for dbpmda
    
    Thanks to Andrew Wansink fo showing how this could be done and providing
    the initial patches.  This checkin refines that work so that readline()
    is used when it is available (and when the lexer is flex) but only when
    the command input is coming from a tty device.
    
    This version also works on vanilla Mac OS X.
    
    The same approach could also be used also for the non-flex lexers,
    but I don't have any way of testing these.